266 
MR. NEWPORT ON THE NERVOUS AND CIRCULATORY SYSTEMS 
Experiment 2. — The head was removed from the body in the third segment, the 
second of the trunk, and acts of locomotion were performed by the body precisely 
as in the last instance, and were always re-excited in the same manner. When turned 
on its back the body was instantly excited to violent contortions, until it had regained 
its proper position, and stood supported on the legs, which were extended, and slowly 
moved as in locomotion, after it had continued to walk for four minutes. When the 
anterior cut extremity of the cord was irritated with a needle, locomotion forwards 
was again induced. Pressure on the anterior segment excited it most readily. Mo- 
tions of the legs were instantly excited by simple contact with any foreign body, and 
those on both sides, anterior and posterior, were moved, but insufficiently for loco- 
motion. Violent contortions were always induced whefi the body was placed on its 
back, until its proper position was regained ; but the motions of the legs were not 
excited by a current of air directed on them from a blowpipe, until after the lapse 
of a few seconds ; but there was always a slight convulsive motion of the body after 
each sudden current. The legs were less excited during the first few hours after 
decapitation by pressure on the posterior than on tiie anterior segments. 
Experiment 3. — The body was divided in the seventh segment while the animal was 
running briskly. It continued to move forwards for a few minutes, but the motions 
gradually became slower and slower, as in the preceding experiments. They were 
actively re-excited by a brisk shake of the table, but soon became quiet with slow but 
very gradual motions of the legs. Progression was always quickly reinduced by 
pressure on the anterior segments, and this was more active than when applied to the 
posterior. It was always reinduced when the cut extremity of the cord was irritated 
slightly with the point of a needle. At the expiration of an hour from the making 
of these experiments, the atmosphere continuing at about the same temperature, 56° 
Fahr., the excised heads of No. 2 and 3. were still living, and exhibited acts of voli- 
tion, and that of the latter, with the segments and legs attached to it, made attempts 
to walk. Both of these moved the antennae briskly, and touched objects that were 
near to them, as if to feel and appreciate. 
Experiment 4. — The body was divided at the fourteenth segment, while running. 
The anterior part exhibited all the voluntary actions of the perfect animal, those of 
touching, avoiding, or seeking an object, and also of locomotion, but its movements 
were slow and were made with difficulty. This arose from want of proper counter- 
poise of the body, since when that was supplied by the proximity of the individual to 
the upright surface of any object, locomotion was well performed. The remaining 
portion of the body was then divided into two parts, both of which were instantly ex- 
cited to movements of the legs when irritated, but without any power of locomotion, 
or ability of either part to support itself in its proper position. The motions of the 
legs were readily induced by a current of air, or when the segments were compressed, 
or the cut end of the cord touched with the point of a needle. At the expiration of 
nine hours the anterior division of the body with the head was dead, and not the 
